Hydraulic motor



Patented June 7, 19,21.

2 SHEETSSHEET 1- CARL Auaus'r RUI ST C. A, RUDQVIST. HYDRAULIC MOTOR. APPLICATION, FYILED NOV. 1, 1920.

2 SHEETS-SHEET Z.

I 1,380,596., Patented June 7,1921.

' CARL AueusT RUDQWST By Atty.

nnrsn stares rarest cam. AUGUST RUDQvIs'r, or srAKEr, swnnnn, ASSIGNOR T J. a c. G. BOLINDERS MEKANISKA VERKSTADTS AKTIEBOLAG, or STOCKHOLM, sw nEN, A MANUFgg- TUBING COMPANY OF SVTEDEN.

HYDRAULIC MOTOR.

reac es.

Application filed. November 1, 1920.

To aZZ whom it may concern:

Be it known that I, CARL AUGUs'r RUD- QVIST, a subject of the King of Sweden, residing at Staket, in the Kingdom of Sweden, have invented a new and useful Improvement in Hydraulic Motors, of which the following in a specification.

The present invention relates to an iniprovement'in hydraulicmotors of the type which are provided with a stationary stator having eccentric bounding surfaces and axial inlet and outlet passages for the driving liquid, and a rotatable casing surrounding said stator in which there are a number of movable pistons or vanes cooperating with the stator.

The invention is characterized by this that the bounding surfaces of the stator have such different shapes that working chambers of different volumes are formed between said surfaces and the casing, each of which chambers communicates through a passage in the stator with an inlet passage, for the purpose of obtaining different speeds of 1 tation and different turning moments of the motor by supplying pressure liquid to one or the other of the working chambers, or to all working chambers simultaneously.

By this construction the usefulness of the hydraulic motor is considerably increased over that of prior constructions. The improved hydraulic motor is adapted to be used in motor cars and the like, and particularly for driving motor plows.

In the accompanying drawing, Figure 1 shows a side view partly in section, and Fig. 2 shows an axial section of a motor according to the present invention. Fig. 3 shows a side view, and Fig. a a plan view of a motor plow driven by the present im proved hydraulic motor.

As shown in Figs. 1 and 2, the trunnions 1 and 2 of the stationary stator 5 are secured in the bearings 3 and 4. The motor casing 6 surrounds the stator 5 and is rotatably mounted on the trunnions 1 and 2 by means of bearings 7 and 8 provided with packings 9 and 10. As shown in Fig. 2, the righthand trunning 1 of the stator 5 is provided with two passages 11 and 12 separated from one another, which passages communicate with radial passages 13 and 14. in the stator, said passages 13 and 14 opening into the casing chamber. The stator is provided Specification of Letters Patent.

Patented June 7, 1921.

Serial No. 421,063.

with two eccentric bounding surfaces 15 and 16, and the interior cylindrical surface of the casing 6 bears against the portions of the surface of the stator between said eccentric surfaces 15 and 16. Owing to the surfaces lfdand 16 having different shapes and eccentricity two working chambers. having different volumes are thus formed between the casing 6 and the stator 5, so that different speeds of rotation and turning moments of the casing may be obtained by supplying pressure liquid to one or the other, or to both of said working chambers. During the rotation of the casing the pistons or vanes 17 in the same bear against the outer bounding surface of the stator 5. The pistons or vanes 17 are guided by balls or rollers 18, and are pressed against the stator by coil springs 19 the tension of which may be adjusted by means of screws 20.

Outlet passages 21, 22 are provided in the stator and lead from the working chambers to the outlet passage 23 in the trunnion 2 to which the pipe conduit 24 is connected.

Instead of providing only two inlet passages 11 and 12 and one outlet passage 23, any suitable number of such passages may of course be used, and the number of outlet passages may be equal to or different.

from the number of inlet passages.

The supply pipe 25 is connected to the lower end of the rotary valve casing 26. The valve 27 in said casing is provided with two apertures 28 and 29 located one above the other and adapted to register with the passages 11 and12 respectively, and with two other apertures 30 and 31 which are located in dilferent radial planes and are adapted to register with the passages 11 and 12 in different positions of rotation of the valve 27. Said valve may be turned by means of the handle 32' and spindle 33.

Spokes 35 are secured to the lugs 34 on the casing 6 and support two Wheel rims 37 provided with buckets 36, said rims serving as driving wheels for a motor plow, as illustrated in Figs. 5 and 6. 38 denotes the pump which is driven directly by the engine 39 and forces pressure liquid through the motor through the pipes 25 and 24:.

The operation of the motor is as follows:

When the valve 27 is in the position shown in Fig. 2, the pressure liquid flows through the pipe 25 and the apertures 28 and 29 in the valve into the passages 11 and 12 and through the passages 13 and 14 into the working chambers. The liquid presses against the pistons or vanes 17 projecting into said chambers and drives the casing 6 around the stator 5 and thus rotates the driving wheels 87 secured to said casing. When during the rotation of the casing the vanes 17 reach the passages 21 and 22 the pressure liquid flows into said passages and escapes through the passage 23 and the outlet pipe 24s In this instance, when the pressure liquid is supplied to both passages 11 and 12 and thus to both working chambers, the motor will obtain its lowest speed but its greatest turning moment.

Two other speeds of the motor may be obtaincdby turning the valve 27 in such manner that the aperture I'll registers with the passage 12, or the aperture 30 registers with the passage 11. In each of these instances one working chamber in t 1e motor is cut out of operation, and in view of the fact that the two working chambers have different volumes the pressure liquid will flow through said chambers when in operation with different velocities. Higher speeds of rotation but smaller turning moments of the casing 6 than in the first instance, will thus be obtained in each of these two latter instances. In the application of the motor for driving motor plows these adjustments of the motor may be used when plowing shallow furrows or when traveling on roads.

I claim:

In a hydraulic motor, the combination of a stationary stator having eccentric bounding surfaces and axial inlet and outlet passages for the driving liquid, a rotatable casing surrounding saidstator, and movable pistons in said casing bearing against the bounding surfaces of said stator, said bounding surfaces having such different shapes as to produce working chambers of different volumes between. said surfaces and said casing, each of which chambers conimunicates with one of said inlet passages.

CARL AUGUST BUD QVIST. 

